I'm running this against OS X Server (Leopard) running cyrus mail.
I'm seeing these errors when running the script with a few modifications. Usually assertions are critical. Can anyone tell me if I should worry about these messages?

I will post all my results when complete...

from the stdout:

MAILBOX:
- Fixing mailbox index file...
- Fixing seen index file (david)...
Converting from /var/imap/user/d/david.seen (skiplist) to /tmp/cyrus-seen (flat)
Converting from /tmp/cyrus-seen.out (flat) to /var/imap/user/d/david.seen (skiplist)
Assertion failed: (key && keylen), function mystore, file cyrusdb_skiplist.c, line 1093.
* Processing subfolder: .vendor.ibm
Converting from /var/imap/mailboxes.db (skiplist) to /tmp/cyrus-mailbox (flat)
- Add mailbox david.vendor.ibm
Converting from /tmp/cyrus-mailbox.out (flat) to /var/imap/mailboxes.db (skiplist)
- Fixing mailbox header file...